page_title: Monroe Township, Middlesex County, New Jersey
section_title: Geography
hierarchical_section_title: Monroe Township, Middlesex County, New Jersey / Geography
caption_attribution_description: English: A view of the landscape at Thompson Park in Monroe Township, NJ.
context_page_description: Monroe Township is a township in southern Middlesex County, New Jersey, United States. It is part of the outer-ring suburbs of the New York Metropolitan area. As of the 2010 United States Census, the township's population was 39,132, reflecting an increase of 11,133 from the 27,999 counted in the 2000 Census, which had in turn increased by 5,744 from the 22,255 counted in the 1990 Census.
  Monroe Township was incorporated as a township by an act of the New Jersey Legislature on April 9, 1838, from portions of South Amboy Township, based on the results of a referendum held that same day. Portions of the township were taken to form East Brunswick, Cranbury, and Jamesburg.
  There are several age-restricted communities in the township. Despite major senior citizen growth, the median age in Monroe has changed from 52.5 in 1990, increasing to 58.9 in 2000, before decreasing back to 53.2 in 2010, as more growth has been from single-family detached homes more recently than with senior citizen developments.
context_section_description: According to the United States Census Bureau, the township had a total area of 42.19 square miles (109.26 km²), including 41.94 square miles (108.63 km²) of land and 0.24 square miles (0.63 km²) of water (0.58%). It is the largest municipality in Middlesex County in terms of total area.
  Clearbrook Park (with a 2010 population of 2,667), Concordia (3,092 in 2010), Rossmoor (2,666 as of 2010), and Whittingham (2,476 in 2010) are unincorporated communities and census-designated places (CDPs) located within Monroe Township.
  Monroe completely surrounds Jamesburg, making it part of 21 pairs of "doughnut towns" in the state, where one municipality entirely surrounds another. The township borders Cranbury Township, East Brunswick Township, Helmetta, Old Bridge Township, South Brunswick Township, and Spotswood in Middlesex County; East Windsor Township in Mercer County; and Manalapan Township and Millstone Township in Monmouth County.
caption: Pastoral view of Monroe
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